Fix lint errors

src/liveedit.h

Index: src/liveedit.h
diff --git a/src/liveedit.h b/src/liveedit.h
index 96dea90d53245a4d34f1586161feef4a9c2a91c7..73aa7d3d3c2120f3ac318fbf6ac99f524234cb85 100644
--- a/src/liveedit.h
+++ b/src/liveedit.h
@@ -65,7 +65,7 @@ namespace internal {
 // also collects compiled function codes.
 class LiveEditFunctionTracker {
  public:
-  LiveEditFunctionTracker(FunctionLiteral* fun);
+  explicit LiveEditFunctionTracker(FunctionLiteral* fun);
   ~LiveEditFunctionTracker();
   void RecordFunctionCode(Handle<Code> code);
   void RecordFunctionScope(Scope* scope);